Early Hints (HTTP 103): announcing critical resources while the server is thinking
With the 103 code the server or CDN tells the browser which resources to download while the page is still being prepared: how it works, when it pays…
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BLOG · WEB PERFORMANCE
Analysis and insights
on real-world performance.
Method, real cases and tools to improve loading, responsiveness and stability, with no shortcuts for the tests.
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Lazy loading done right: when to defer images and when it is a mistake
Deferred loading reduces transferred data, but on the wrong image it worsens LCP: how loading=”lazy” works, which images to defer, how WordPress behaves and how to check it.
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Back/forward cache: why your site’s Back button is slow
The back/forward cache makes going back to the previous page instant, but many sites are excluded from it without knowing: how it works, what blocks it and how…
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Speculation Rules and prerendering: pages that open in zero seconds
With prefetch and prerender the browser loads the next page before the click: how Speculation Rules work, how to choose the eagerness and how to handle analytics, server…
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Core Web Vitals: what does the LCP (Largest Contentful Paint) metric measure?
LCP measures when the main content of the page appears: how the browser chooses the element, the four phases it breaks down into, the most common causes and…
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